98f6b2f1a5
* set environment variables before starting QApp * fix-422 * Better support of hidpi * Fix Typo in App-Name * Remove fontScaleFactor bits * Add documenation for hidpi displays
63 lines
1.5 KiB
Python
63 lines
1.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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Use a HistogramLUTWidget to control the contrast / coloration of an image.
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"""
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## Add path to library (just for examples; you do not need this)
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import initExample
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import numpy as np
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from pyqtgraph.Qt import QtGui, QtCore
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import pyqtgraph as pg
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app = pg.mkQApp("Histogram Lookup Table Example")
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win = QtGui.QMainWindow()
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win.resize(800,600)
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win.show()
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win.setWindowTitle('pyqtgraph example: Histogram LUT')
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cw = QtGui.QWidget()
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win.setCentralWidget(cw)
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l = QtGui.QGridLayout()
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cw.setLayout(l)
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l.setSpacing(0)
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v = pg.GraphicsView()
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vb = pg.ViewBox()
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vb.setAspectLocked()
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v.setCentralItem(vb)
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l.addWidget(v, 0, 0, 3, 1)
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w = pg.HistogramLUTWidget()
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l.addWidget(w, 0, 1)
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monoRadio = QtGui.QRadioButton('mono')
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rgbaRadio = QtGui.QRadioButton('rgba')
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l.addWidget(monoRadio, 1, 1)
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l.addWidget(rgbaRadio, 2, 1)
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monoRadio.setChecked(True)
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def setLevelMode():
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mode = 'mono' if monoRadio.isChecked() else 'rgba'
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w.setLevelMode(mode)
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monoRadio.toggled.connect(setLevelMode)
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data = pg.gaussianFilter(np.random.normal(size=(256, 256, 3)), (20, 20, 0))
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for i in range(32):
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for j in range(32):
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data[i*8, j*8] += .1
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img = pg.ImageItem(data)
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vb.addItem(img)
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vb.autoRange()
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w.setImageItem(img)
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## Start Qt event loop unless running in interactive mode.
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if __name__ == '__main__':
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import sys
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if (sys.flags.interactive != 1) or not hasattr(QtCore, 'PYQT_VERSION'):
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QtGui.QApplication.instance().exec_()
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